Stem erect, 50-80 cm tall, to 7 mm in diam. at base, glabrous or distally and sometimes at base shortly brown pilose. Basal leaves petiolate; petiole to 30 cm, slender, glabrous, base enlarged sheathed; leaf blade abaxially pale green, adaxially green, reniform, 5-16 × 8-20 cm, abaxially glabrous or pubescent along veins, adaxially glabrous, palmately veined, margin deeply coarsely dentate, apex retuse; teeth irregularly triangular-lanceolate, to 2 cm wide, apex blackish purple and mucronate, recurved; sinus ca. 1/3 as long as leaf blade, broad, basal lobes subdivergent. Middle stem leaves smaller, reniform, shortly petiolate; sheath enlarged, broadly ovate, margin entire. Distalmost stem leaves only enlarged sheathed. Compound corymbs branched; branches to 15 cm, densely shortly pilose; leaflike and supplementary bracts linear-subulate, shorter; peduncles to 1.5 cm, slender, densely shortly pilose. Capitula numerous. Involucre narrowly cylindric, ca. 1 cm, rarely to 1.3 cm, 3-4 mm wide, outside glabrous; phyllaries 5-8, in 2 rows, linear-lanceolate, 1.5-2 mm wide, purple ciliate, apex acute; inner phyllaries membranous at margin. Florets 6-8, yellow, all tubular, 8-9 mm; tube slightly longer than limb. Achenes yellowish brown, cylindric, 4-5.5 mm. Pappus white, ca. 7 mm, shorter than tubular corolla. Fl. Sep.
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